Preparation method of lignin-based flexible nano carbon fiber self-supporting electrode material

A technology of nano-carbon fiber and self-supporting electrode, which is applied in fiber processing, nanotechnology, nanotechnology, etc., can solve the problems of complex assembly process of energy storage device, brittleness of nano-carbon fiber, low utilization rate of lignin, etc., and achieve excellent energy storage properties, good flexibility, and the effect of reducing the internal resistance of electrodes

Active Publication Date: 2020-08-18
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a lignin-based flexible nano-carbon fiber self-supporting electrode material, which solves the problems of low lignin utilization in the prior art, and the brittleness of the nano-carbon fiber obtained in the existing preparation method. Problems such as complex process of energy storage device

Method used

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  • Preparation method of lignin-based flexible nano carbon fiber self-supporting electrode material
  • Preparation method of lignin-based flexible nano carbon fiber self-supporting electrode material
  • Preparation method of lignin-based flexible nano carbon fiber self-supporting electrode material

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Embodiment 1

[0063] The preparation method of the above-mentioned lignin-based flexible nano-carbon fiber self-supporting electrode material specifically includes the following steps:

[0064] Step 1: Dissolve polyacrylonitrile in a mixed solvent of dimethyl sulfoxide and N,N-dimethylformamide, stir for 2 hours with a magnetic stirrer until the solution is clear, add alkaline lignin, and continue stirring for 7 hours , wherein the volume ratio of dimethyl sulfoxide to N,N-dimethylformamide is 6:4, and the mass ratio of alkaline lignin to polyacrylonitrile is 9:1; mix evenly to make a mass ratio concentration of 30 %, the viscosity is the precursor solution of 3Pa s;

[0065] Step 2: The above-mentioned precursor solution prepared in step 1 is made into a precursor composite nanofiber film through an electrospinning process; the parameters of the electrospinning process: the spinning temperature is 30°C, the relative humidity is 32RH%, and the spinning voltage It is 25kV, the perfusion rat...

Embodiment 2

[0070] The preparation method of the above-mentioned lignin-based flexible nano-carbon fiber self-supporting electrode material specifically includes the following steps:

[0071] Step 1: Dissolve polyvinylidene fluoride in a mixed solvent of dimethyl sulfoxide and N,N-dimethylformamide, stir for 5 hours with a magnetic stirrer until the solution is clear, add sodium lignosulfonate, and continue Stir for 10 hours, wherein the volume ratio of dimethyl sulfoxide to N,N-dimethylformamide is 7:3, and the mass ratio of sodium lignosulfonate to polyvinylidene fluoride is 8:2; mix evenly to make a uniform A stable precursor solution with a mass ratio concentration of 28% and a viscosity of 2.5 Pa s;

[0072] Step 2: The above precursor solution prepared in step 1 is made into a precursor composite nanofiber film through an electrospinning process; the parameters of the electrospinning process: the spinning temperature is 40°C, the relative humidity is 25RH%, and the spinning voltage ...

Embodiment 3

[0076] The preparation method of the above-mentioned lignin-based flexible nano-carbon fiber self-supporting electrode material specifically includes the following steps:

[0077] Step 1: Dissolve polylactic acid in a mixed solvent of dimethyl sulfoxide and N,N-dimethylformamide, stir for 4 hours with a magnetic stirrer until the solution is clear, add hydroxylated alkali lignin, and continue stirring for 9 hours , wherein the volume ratio of dimethyl sulfoxide to N,N-dimethylformamide is 9:1, and the mass ratio of hydroxylated alkali lignin to polylactic acid is 9:1; mix uniformly to make a uniform and stable mass ratio A precursor solution with a concentration of 35% and a viscosity of 4Pa·s;

[0078] Step 2: The above precursor solution prepared in step 1 is made into a precursor composite nanofiber membrane through an electrospinning process. Electrospinning process parameters: the spinning temperature is 37°C, the relative humidity is 28RH%, the spinning voltage is 30kV,...

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Abstract

The invention discloses a preparation method of a lignin-based flexible nano carbon fiber self-supporting electrode material. The preparation method comprises the steps that 1), carrier polymer and lignin are sequentially dissolved in a solvent, and a precursor solution is obtained, wherein the mass ratio of the lignin to the carrier polymer is 7:3-9:1, and the mass ratio concentration of the precursor solution is 20-35%; 2), a precursor composite nanofiber film is obtained by the precursor solution through electrostatic spinning technology; and 3), pre-oxidation treatment in the air atmosphere and carbonization treatment in the inert atmosphere are successively carried out on the composite nanofiber film, and the flexible nano carbon fiber film is obtained. The prepared nano carbon fiberhas the large specific surface area and good flexibility, is free of adding a binder and can be directly used as an independent electrode, and the internal resistance of the electrode is reduced; anda high specific capacitance can still be obtained without adding a conductive material, and the energy storage property is excellent.

Description

technical field [0001] The invention belongs to the technical field of biomass nano-carbon fibers, and relates to a preparation method of a lignin-based flexible nano-carbon fiber self-supporting electrode material. Background technique [0002] With the rapid development of the global economy, the depletion of fossil fuels and the increasing environmental pollution, people's demand for sustainable and renewable energy is increasing, which prompts people to study efficient and green energy conversion and storage devices to meet the needs of the future world urgent need for energy. Among various energy storage devices, supercapacitors have attracted great attention due to their high power density, high cycle stability, and high energy density. The electrode material has an important influence on the energy storage properties. Carbon materials are widely used in the field of electrodes due to their good electrical conductivity, stable chemical properties and multi-level pore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4382D04H1/728D01D5/00D06C7/04H01G11/34H01G11/36H01G11/44D01F9/17D01F9/21D01F9/22D01F9/24D01F9/26B82Y30/00B82Y40/00
CPCD04H1/4382D04H1/728D01D5/0092D01D5/003D06C7/04D01F9/17D01F9/22D01F9/21D01F9/24D01F9/26H01G11/36H01G11/44H01G11/34B82Y30/00B82Y40/00Y02E60/13
Inventor 刘呈坤吴红毛雪孙润军陈美玉
Owner XI'AN POLYTECHNIC UNIVERSITY
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